Legio XXII Primigenia

Legio XXII Primigenia was a Roman legion which was founded in 39 AD by Emperor Caligula for use in his campaigns in Germania. It was headquartered in Mogontiacum (Mainz) for much of its history, guarding the Rhine border. In 235, the legion murdered Emperor Alexander Severus when he tried to negotiate with the Alemanni, acclaiming Maximinus Thrax as the new emperor. In 269, it proclaimed Laelianus as Emperor of the Gallic Empire during the Crisis of the Third Century. The legion was destroyed at the Battle of Mursa Major in Croatia in 351, but it was later revived and stationed in Gallia Belgica at the turn of the 5th century.